Moetisiitg-machine



UNITED STATESl PATENT GFFICE.

BENJ. H. OTIS, 0F DEDHAM, MASSACHUSETTS.

1VIOR1ISING-1VIACHINE.

Specification of Letters Patent No. 4,887, dated February 20, 1846.

To @ZZ whom t may concern:

Be it known that I, BENJAMIN H. Oris,

of Dedham, in the county of Norfolk and State of Massachusetts, have invented new 5 and useful Improvements in Mortising-Machines, and that the following description,

taken in connection with the accompanying drawings, hereinafter referred to, forms a full and exact specification of the same, wherein I have set forth the nature and principles of my said improvements by which my invention may be distinguished from others of a similar class, together with such parts or combinations as I claim and desire to have secured to me by Letters Patent.

My improvements consist iirst in a novel combination of mechanical means for eiectling an easy, accurate and speedy lateral adjustment of the mortising chisel and its supporter, so that two parallel mortises may be cut in the same plank; and also in a novel mechanical arrangement or provision for turning said chisel and supporter around ninety degrees, so that after one head of a mortise is formed perpendicular to the face of a plank, or parallel to the back of the chisel, the opposite head of the mortise, (when it is approached by sliding the plank along, on the shelf of the machine), may be parallel to the head lirst formed, and like it parallel to the vertical back side of the chisel.

The gures of the accompanying plate of drawings represent my improved mortising machine.

Figure l, is a front View of the same. Fig. 2 is a side View, Figs. 3, 4, 5 and 6 being detail views of some important parts and which will be referred to in the sequel.

A A A in the several drawings is the framework of the machine, consisting of horizontal joists, properly framed together and a vertical standard B B, strongly braced with diagonal braces, as shown in -seen by inspection of Figs. l, and 2. The

chisel @Z Figs. 1, and 2 is supported and con ned in any proper manner in the vertical sliding bar or rod e e, which bar moves up and down in suitable holes in the front ends of the horizontal guiding rods f, g, said guiding rods resting in suitable eyes formed or inserted through the vertical standard post B B, where the rods f, g, in

Figs. 1, 2 and 3, are seen to be situated.

The last named figure (3) is a detail elevation of the back plate bf Z9 and parts con nected to the same as hereinafter specified. The sliding rod or bar e e is hung or suspended on the top of the spiral or helical spring h L, bygneans of the adjustable cylindrical collar, Z, on said rod and rwhich rests on the top of said spring, while the bottom of the spring rests on the inner end of the guiding rod g as shown in Figs. l, and 2. The elastic power of said spring, it will be seen may be diminished or increased by sliding the collar Z up or down on the rod e e. The oliice of said spring ZL ZL, is to retract the chisel Z and rod e e after each depression of the same, which retracting in the machines is effected, by a horizontal spring attached to the top of the chisel rod e e in a manner well known.

The rod e e with its chisel Z is depressed in the following manner, and through the medium of the following described mechanism. A cylindrical collar Za Figs. l, and

2, encircles loosely the top of the rod e e and around, and to this collar a forked plate Z Z is securely fastened (see Figs. 4; and 5, which are detail views of said collar c and plate Z Z). The armsof said plate Z Z clasp, straddle, or fit and slide against the sides of the post B B, which post there-V by serves as a guide to any movements of the said plate. The collar if: rests on the top of another similar collar g which is firmly attached to the chisel rod e e. The tops of the connecting rods m m, m m, pass up through holes in the arms of the plate Z Z, and have nuts screwed to them as shown in Figs. l and 2, which nuts rest on the to-p faces of said arms. The lower ends of these connecting rods m m, m m are arranged so as to play on the screws or pins at fn., fn. Figs. l and 2, which pins are fastened to the sides of the treadle lever o 0, as shown in the figures. The treadle lever o 0 has a fulcrum at p Fig. 2, and is made curved as shown in said figure, in lieu of straight, so that when the foot is applied to the front end of the same for the purpose of depressing the chisel bar, the pressure will be the more direct, the nearer said front end is depressed to the level of the fulcrum of t-he treadle.

The collar g, above mentioned as firmly attached to the chisel rod e e, has om itsupper side two angular shaped studs or teeth r, r directly opposite. eaclr` other in a line at right angles to the back of the chisel. These studs fit into corresponding grooves or notches s, s, on the underside of the. collar 7c, in which the chisel bar e e plays; said notches-8,8, beingshown in Fig. 5', which is aview of the lower side of the plate Z, Z andi collar 7c. ment of the` two collars le, g, at the top of the chisel rod in conjunction` with the suspension. or' supporting of said rod on a spiral spring as described,` provides, as will,` readily be perceived, for turning the chisel rody (with the chisel), around ninety degrees by the handle t, for the object herein above specified ofmaling the two heads of a mortise parallel and vertical.` The reason for this is thatv the spring 71. 7L.. will yield' suiiiciently, when itis requisite, to allow the studs r, r, to disengage from the` notches s, s, and permit the turning as specified', f

while when the said studs and: notches ofVV the collars 7d and g are in connection, the chisel is held as firmly almost as it would; be if it were not susceptible of the change described.

rIhe arrangement for the lateral. adjustment' ofthe chisel rod &c. consists ofthe following combination of mechanical parts. The two horizontalA guiding rods f, g, slide forward and back in the eyes Jformed for.

them. in the post B B, as above suggested,

and. at the rear end ofI each of" these rods, the slotted' end (shown by dotted linesin Fig, 2) ofaV curved lever u, /v is connected. by means of pins which pass through the slots of the levers 16,4) andthe ends of said rods; f, g; said'` ends being forked for the insertion of the slotted lever ends (see Figs. 2 and 3). The levers u, 'v have fulcra in thev horizontal pins, a", at', which project Such an arrangefrom, and are secured to the baclrplate 7J b. The other ends of the levers u o are also slotted, like those before named (and asl shown by dotted lines in Fig. 2) and are fastened by pins, between the ears 3.0.. c. andi` al cl on the upper and under side respectively of the guiding nut e `which.-` nut slides` on the.` horizontal rod f attached to the back plate b `midway between the fulcrum pins a a. `The sliding nut e may be secured in any Iposition onztherod f bythe confining screw L g, g" working in` each side of said nut as` shown in Figs. 3, and` 6... i

i thenut e may be made to slide forward. or`

`back on ther rod f", and thatsuch sliding will through the medium of the levers 10,11,

fo'rcethe arms #andi g, (with the chisel rodfv held, in: the same),y forward` and back,

` in anA easy, quick,` and accurate` manner.

Havingfthusdescribed my improved morjtising machine I' shall state. my` claim as `follows:

` tolhavesecured to me by LettersPatentisf same spiral spring. that retracts the. chisel,

I (by the combinations above stated), allows,

or` provides for the turning around of the chisel ninety degrees, for the purpose-'and` `inthe manner hereinbefore` set forth.

description of" my said invention and im.-

provements I have` hereto set my signature,

this fifteenth day of' September in the. year 1845..

BENJAMIN H. OTlSu Witnesses:I

EZRA LINCOLN, J'r.. H. LINCOLN..

From the above it will, be seen, thatby unlooseningthescrews gf, gf, at any time,

What I claim vas my invention and desire.`

The combinationof'the loose collar cf and. `and fast collar Q, arranged at the top of.' the chisel rod, andfhaving` notches s, s, and. studs or teeth r, r, respectively as above` described, with the spiral'. spring on which.. the said' chisel rod is supported,` so that the- In testimony that the foregoing., is av true` 

